CCP seems low.
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Road Captain
Joined: Aug 2006
Posts: 707
Likes: 38
CCP seems low.
I'm trying to tune a 2020 lowrider S right now with the following build:
Fm 128" 11.0:1 big bore kit, fM
level b heads, Wood
Performance .600 lift beehive
style springs, woods 9f60 cam,
hpi 6.2 injectors, hpi 62mm
throttle body, fm ac de air
cleaner kit +1 oversized filter,
s&s cam plate oil pump, fuel
moto adjustable push rods,
woods alpha lifters, thrashin AR
exhaust.
It's being a real pain to tune and numbers so far are 137/138 with a really choppy graph and pretty soft on bottom. I decided to do a compression test on it and it came back at 184/182 (ACR's turned off in Map and throttle plate open). Does this seem really low to you guys? I don't know the specs on the build other than what I put above. CCP and HP/TQ all seem pretty low for the build, I'm kinda worried something may be off in the cam chest. Have any of you built something similar that can share what your CCP was? Big boyz calculator doesn't have the M8 cams and I can't find specs to manually add them to the calculator. Thanks for any help you guys can give.
Fm 128" 11.0:1 big bore kit, fM
level b heads, Wood
Performance .600 lift beehive
style springs, woods 9f60 cam,
hpi 6.2 injectors, hpi 62mm
throttle body, fm ac de air
cleaner kit +1 oversized filter,
s&s cam plate oil pump, fuel
moto adjustable push rods,
woods alpha lifters, thrashin AR
exhaust.
It's being a real pain to tune and numbers so far are 137/138 with a really choppy graph and pretty soft on bottom. I decided to do a compression test on it and it came back at 184/182 (ACR's turned off in Map and throttle plate open). Does this seem really low to you guys? I don't know the specs on the build other than what I put above. CCP and HP/TQ all seem pretty low for the build, I'm kinda worried something may be off in the cam chest. Have any of you built something similar that can share what your CCP was? Big boyz calculator doesn't have the M8 cams and I can't find specs to manually add them to the calculator. Thanks for any help you guys can give.
Thread Starter
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Road Captain
Joined: Aug 2006
Posts: 707
Likes: 38
Originally Posted by rigidthumper
9F60 specs: 24/52, 54/22, .6 lift, 46° overlap, LCA 105°.
Last edited by 2deuceguy; Oct 18, 2022 at 10:14 AM.
Road Master
Joined: Jun 2019
Posts: 952
Likes: 528
From: Richmond TX
Seems like 180 psi CCP used to be thought of as right in the sweet spot. For whatever reason these M8's run well with a lot more. The T-Man web page claims that the stock CVO 117 engines have a CCP between 230-235 psi. That used to be unthinkable.....
It seems unlikely but maybe you missed by a tooth on the cam chain?
It seems unlikely but maybe you missed by a tooth on the cam chain?
Thread Starter
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Road Captain
Joined: Aug 2006
Posts: 707
Likes: 38
Originally Posted by Since 1968
Seems like 180 psi CCP used to be thought of as right in the sweet spot. For whatever reason these M8's run well with a lot more. The T-Man web page claims that the stock CVO 117 engines have a CCP between 230-235 psi. That used to be unthinkable.....
It seems unlikely but maybe you missed by a tooth on the cam chain?
It seems unlikely but maybe you missed by a tooth on the cam chain?
Seasoned HDF Member
Joined: Aug 2017
Posts: 7,323
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From: Omaha,NE
I doubt it would even idle if the cam timing was off even a single tooth, let alone run.
Grand HDF Member
Joined: Jul 2007
Posts: 3,736
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From: Bates County MO
They will run, act richer than normal, and make 12-15% less power than expected (not admitting to anything...)
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Road Master
Joined: Jun 2019
Posts: 952
Likes: 528
From: Richmond TX
Another 'Hail Mary' guess, pushrod adjustment is leaving one or more valves ever so slightly open? It would be nice if somebody with a stour 128 like yours could chime in with their HP/Torque numbers. Maybe you're numbers are 'as expected'?
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From: Massachusetts
I'm trying to tune a 2020 lowrider S right now with the following build:
Fm 128" 11.0:1 big bore kit, fM
level b heads, Wood
Performance .600 lift beehive
style springs, woods 9f60 cam,
hpi 6.2 injectors, hpi 62mm
throttle body, fm ac de air
cleaner kit +1 oversized filter,
s&s cam plate oil pump, fuel
moto adjustable push rods,
woods alpha lifters, thrashin AR
exhaust.
It's being a real pain to tune and numbers so far are 137/138 with a really choppy graph and pretty soft on bottom. I decided to do a compression test on it and it came back at 184/182 (ACR's turned off in Map and throttle plate open). Does this seem really low to you guys? I don't know the specs on the build other than what I put above. CCP and HP/TQ all seem pretty low for the build, I'm kinda worried something may be off in the cam chest. Have any of you built something similar that can share what your CCP was? Big boyz calculator doesn't have the M8 cams and I can't find specs to manually add them to the calculator. Thanks for any help you guys can give.
Fm 128" 11.0:1 big bore kit, fM
level b heads, Wood
Performance .600 lift beehive
style springs, woods 9f60 cam,
hpi 6.2 injectors, hpi 62mm
throttle body, fm ac de air
cleaner kit +1 oversized filter,
s&s cam plate oil pump, fuel
moto adjustable push rods,
woods alpha lifters, thrashin AR
exhaust.
It's being a real pain to tune and numbers so far are 137/138 with a really choppy graph and pretty soft on bottom. I decided to do a compression test on it and it came back at 184/182 (ACR's turned off in Map and throttle plate open). Does this seem really low to you guys? I don't know the specs on the build other than what I put above. CCP and HP/TQ all seem pretty low for the build, I'm kinda worried something may be off in the cam chest. Have any of you built something similar that can share what your CCP was? Big boyz calculator doesn't have the M8 cams and I can't find specs to manually add them to the calculator. Thanks for any help you guys can give.
Ring alignment wrong? Rings still not seated? Was deck height checked? Someone use a +4 -4 crank sprocket? Maybe a leak down test would rule out cylinder, rings,barrel and valve issues.
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Road Captain
Joined: Aug 2006
Posts: 707
Likes: 38
Originally Posted by jake24lt
Out of curiosity, who assembled the engine?
Ring alignment wrong? Rings still not seated? Was deck height checked? Someone use a +4 -4 crank sprocket? Maybe a leak down test would rule out cylinder, rings,barrel and valve issues.
Ring alignment wrong? Rings still not seated? Was deck height checked? Someone use a +4 -4 crank sprocket? Maybe a leak down test would rule out cylinder, rings,barrel and valve issues.